package com.wyb.filter;

import com.wyb.pojo.LoginUser;
import com.wyb.utils.JwtUtil;
import com.wyb.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        //获取token
        if(!request.getRequestURI().contains("/article/")){
            String token = request.getHeader("token");
            if (!StringUtils.hasText(token)||(token.equals("null"))) {
                //放行
                filterChain.doFilter(request, response);
                return;
            }
            //解析token
            String userId;
            try {
                Claims claims = JwtUtil.parseJWT(token);
                userId = claims.getSubject();
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println(token);
                throw new RuntimeException("token非法");
            }
            //从redis中获取用户信息
            LoginUser loginUser = redisCache.getCacheObject("login:" + userId);
            if(Objects.isNull(loginUser)){
                throw new RuntimeException("用户未登录");
            }
            //存入SecurityContextHolder
            //TODO 获取权限信息封装到Authentication中
            UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null,loginUser.getAuthorities());
            SecurityContextHolder.getContext().setAuthentication(authenticationToken);

            //放行
            filterChain.doFilter(request, response);
        }
        else {
            filterChain.doFilter(request, response);
        }
        }
    }

